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imi i tang www JOSEPH H. DAVIsOF ALLEGHENY, PENNSYLVANIA.

.Letters 'Patent No. 85,288, dated December '29, 1868.

'IMPROVEMENT IN STOP-VALVES PoRV STEAM AND OTHER ENGINERY The Schedulereferred to :in these Letters Patent and making part of the same.

To all whom it 'may concern:

Be it knownthat I, Josnrir 1H. Davis, ofthe city land countyofAllcgheny, and State of Pennsylvania, have invented a new and usefulImprovement in ValvevCocks for Steam and other Engincry", and I dohercby declare thzit the following is-a fuli, clear, and exactdescription thereof, reference beinhad to the accoinpa-nying,- drawings,aml to the letters of retin-ence marked thereon. p

The nature ot' my invention consists in such a con-v struction andcombination ot' the valve-chamber ot' a Valve-cock, with acoupling-pipe, that the bore of said pipe and chamber shalhbe the sameunder all sizes oi' construction.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation.

In the, accompanying drawings, which form part of my speciicationElgin-e 1 is a side elevation of my improvement in i valve-cocks.

of the same.

form of valve-cock, it is necessary, under all sizes Of construction, tomake the valve-chamber larger than the bore of thecoupling-pipe, so thatthe diameter of the opening in the valve-seat may be of the sa-nlediameter as the diameter of the bore of t-he couplingpipe. v

- Tosinjiplity the construction` of valve-cocks, the valves have beenmade elliptical in form, andthe Valves have also been set :it :differentangles with relation to the plane of the bore of the coupling-pipe; butin every case the size ofthe valve-chamber has t0 be increa-sed when thesize ofthe valve-cock and coupling-pipeis varied. I overcome thisdifficulty by making a slight-jbend-Ior curvature, in the coupling-pipe,clearly shown in the accompanying drawings, thereby simplifying theconstruction of mlve-cocks in point ot' labor and cost, and alsoobtaining the very desirable and Very appa-rent advantage of having the\'al''ecl1a1nber and coupling-pipe ofthe same diameter.

Having thus described the nature, construction, and operation of myimprovement,

What l claim as of my imfention, is- The construction and combination ofthe Valvechamber ot' uvalve-cock with a coupling-pipe, Whereby the boreofsaid pipe, chamber, and opening in the valve-seat shall, under allsizes of construction, be the same, substantially as` herein described.

Jos. H. Danis,

